| The role of nonlinearities associated with air-sea coupling processes in El Nino's peak-phase locking | |
Duan WanSuo1; Zhang Rui1,2 ; Yu YanShan3; Tian Ben1,2; Duan, WS
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| 2013-11-01 | |
| 发表期刊 | SCIENCE CHINA-EARTH SCIENCES
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| ISSN | 1674-7313 |
| 卷号 | 56期号:11页码:1988-1996 |
| 文章类型 | Article |
| 摘要 | We use conditional nonlinear optimal perturbation (CNOP) to investigate the optimal precursory disturbances in the Zebiak-Cane El Nino-Southern Oscillation (ENSO) model. The conditions of the CNOP-type precursors are highly likely to evolve into El Nino events in the Zebiak-Cane model. By exploring the dynamic behaviors of these nonlinear El Nino events caused by the CNOP-type precursors, we find that they, as expected, tend to phase-lock to the annual cycles in the Zebiak-Cane model, with the SSTA peak at the end of a calendar year. However, El Nino events with CNOPs as initial anomalies in the linearized Zebiak-Cane model are inclined to phase-lock earlier than nonlinear El Nino events despite the existence of annual cycles in the model. It is clear that nonlinearities play an important role in El Nino's phase-locking. In particular, nonlinear temperature advection increases anomalous zonal SST differences and anomalous westerlies, which weakens anomalous upwelling and acts on the increasing anomalous vertical temperature difference and, as a result, enhances El Nino and then delays the peak SSTA. Finally, we demonstrate that nonlinear temperature advection, together with the effect of the annual cycle, causes El Nino events to peak at the end of the calendar year.; We use conditional nonlinear optimal perturbation (CNOP) to investigate the optimal precursory disturbances in the Zebiak-Cane El Nino-Southern Oscillation (ENSO) model. The conditions of the CNOP-type precursors are highly likely to evolve into El Nino events in the Zebiak-Cane model. By exploring the dynamic behaviors of these nonlinear El Nino events caused by the CNOP-type precursors, we find that they, as expected, tend to phase-lock to the annual cycles in the Zebiak-Cane model, with the SSTA peak at the end of a calendar year. However, El Nino events with CNOPs as initial anomalies in the linearized Zebiak-Cane model are inclined to phase-lock earlier than nonlinear El Nino events despite the existence of annual cycles in the model. It is clear that nonlinearities play an important role in El Nino's phase-locking. In particular, nonlinear temperature advection increases anomalous zonal SST differences and anomalous westerlies, which weakens anomalous upwelling and acts on the increasing anomalous vertical temperature difference and, as a result, enhances El Nino and then delays the peak SSTA. Finally, we demonstrate that nonlinear temperature advection, together with the effect of the annual cycle, causes El Nino events to peak at the end of the calendar year. |
| 关键词 | El Nino Event Nonlinearity Optimal Perturbation Numerical Model |
| 学科领域 | Geology |
| DOI | 10.1007/s11430-013-4629-y |
| URL | 查看原文 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS研究方向 | Geology |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS记录号 | WOS:000326459500017 |
| WOS关键词 | OCEAN-ATMOSPHERE MODEL ; SOUTHERN-OSCILLATION ; SEASONAL CYCLE ; OPTIMAL PERTURBATION ; RECHARGE PARADIGM ; ENSO ; PREDICTABILITY ; PREDICTION ; CHAOS ; VARIABILITY |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/16320 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Duan, WS |
| 作者单位 | 1.Chinese Acad Sci, Inst Atmospher Phys, LASG, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Ocean, Qingdao 266071, Peoples R China |
| 推荐引用方式 GB/T 7714 | Duan WanSuo,Zhang Rui,Yu YanShan,et al. The role of nonlinearities associated with air-sea coupling processes in El Nino's peak-phase locking[J]. SCIENCE CHINA-EARTH SCIENCES,2013,56(11):1988-1996. |
| APA | Duan WanSuo,Zhang Rui,Yu YanShan,Tian Ben,&Duan, WS.(2013).The role of nonlinearities associated with air-sea coupling processes in El Nino's peak-phase locking.SCIENCE CHINA-EARTH SCIENCES,56(11),1988-1996. |
| MLA | Duan WanSuo,et al."The role of nonlinearities associated with air-sea coupling processes in El Nino's peak-phase locking".SCIENCE CHINA-EARTH SCIENCES 56.11(2013):1988-1996. |
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| The role of nonlinea（887KB） | 限制开放 | CC BY-NC-SA | 浏览 | |||
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